// JavaScript Document
jQuery.extend({

    createUploadIframe: function(id, uri)
 {
   //create frame
            var frameId = 'jUploadFrame' + id;
           
            if(window.ActiveXObject) {
                //var io = document.createElement('<iframe id="' + frameId + '" name="' + frameId + '" />');
                   if(jQuery.browser.version== "9.0" || jQuery.browser.version=="10.0" ){ 
                    var io = document.createElement( 'iframe'); 
                    io.id = frameId; 
                    io.name = frameId; 
                } else if(jQuery.browser.version== "6.0" || jQuery.browser.version=="7.0" || jQuery.browser.version=="8.0"){ 
                    var io = document.createElement( '<iframe id="' + frameId + '" name="' + frameId + '" />' ); 
                      if( typeof uri== 'boolean'){
                          io.src = 'javascript:false';
                      }
                      else if( typeof uri== 'string'){
                          io.src = uri;
                      }
                }
            } else {
                var io = document.createElement( 'iframe');
                io.id = frameId;
                io.name = frameId;
            }
            io.style.position = 'absolute';
            io.style.top = '-1000px';
            io.style.left = '-1000px';

            document.body.appendChild(io);

            return io;  
    },
    createUploadForm: function(id, fileElementId, data)
 {
  //create form
  var formId = 'jUploadForm' + id;
  var fileId = 'jUploadFile' + id;
  var form = jQuery('<form  action="" method="POST" name="' + formId + '" id="' + formId + '" enctype="multipart/form-data"></form>' );
  if(typeof(fileElementId) == 'string'){  
      fileElementId = [fileElementId];  
  }  
  for(var i in fileElementId){  
      var oldElement = jQuery('#' + fileElementId[i]);  
      var newElement = jQuery(oldElement).clone();  
      jQuery(oldElement).attr('id', fileId);  
      jQuery(oldElement).before(newElement);  
      jQuery(oldElement).appendTo(form);  
  } 
 
  //add data
  if(data) {
    for (var i in data) {
        $('<input type="hidden" name="' + i + '" value="' + data[i] + '" />').appendTo(form);
    }
  }
  //set attributes
  jQuery(form).css('position', 'absolute');
  jQuery(form).css('top', '-1200px');
  jQuery(form).css('left', '-1200px');
  jQuery(form).appendTo('body'); 
  return form;
    },

    ajaxFileUpload: function(s) {
        // TODO introduce global settings, allowing the client to modify them for all requests, not only timeout 
        s = jQuery.extend({}, jQuery.ajaxSettings, s);
        var id = s.id;       
        //var id = s.fileElementId;       
             var form = jQuery.createUploadForm(id, s.fileElementId,s.data);
             var io = jQuery.createUploadIframe(id, s.secureuri);
             var frameId = 'jUploadFrame' + id;
             var formId = 'jUploadForm' + id; 
       
             if( s.global && ! jQuery.active++ ){
                   // Watch for a new set of requests
                  jQuery.event.trigger( "ajaxStart" );
            }           
        var requestDone = false;
        // Create the request object
        var xml = {};  
        if( s.global ){
         jQuery.event.trigger( "ajaxSend", [xml, s]);
        }           
       
        var uploadCallback = function(isTimeout){ 
                   // Wait for a response to come back
                   var io = document.getElementById(frameId);
                   try{   
                         if(io.contentWindow){
                              xml.responseText = io.contentWindow.document.body?io.contentWindow.document.body.innerHTML:null;
                              xml.responseXML = io.contentWindow.document.XMLDocument?io.contentWindow.document.XMLDocument:io.contentWindow.document;
                      } else if(io.contentDocument){
                        xml.responseText = io.contentDocument.document.body?io.contentDocument.document.body.innerHTML:null;
                        xml.responseXML = io.contentDocument.document.XMLDocument?io.contentDocument.document.XMLDocument:io.contentDocument.document;
                      }     
                  } catch(e){
                        jQuery.handleError(s, xml, null, e);
                  }
            if( xml || isTimeout == "timeout"){   
                requestDone = true;
                var status;
                try {
                    status = isTimeout != "timeout" ? "success" : "error";
                    // Make sure that the request was successful or notmodified
                    if( status != "error" ){
                        // process the data (runs the xml through httpData regardless of callback)
                        var data = jQuery.uploadHttpData( xml, s.dataType );                       
                        if( s.success ){
                               // ifa local callback was specified, fire it and pass it the data
                              s.success( data, status );
                        };                
                        if( s.global ){
                               // Fire the global callback
                              jQuery.event.trigger( "ajaxSuccess", [xml, s] );
                        };                           
                    } else{
                     jQuery.handleError(s, xml, status);
                    }
                       
                } catch(e){
                    status = "error";
                    jQuery.handleError(s, xml, status, e);
                };               
                if( s.global ){
                   // The request was completed
                        jQuery.event.trigger( "ajaxComplete", [xml, s] );
                };

                // Handle the global AJAX counter
                if(s.global && ! --jQuery.active){
                 jQuery.event.trigger( "ajaxStop");
                };
                if(s.complete){
                  s.complete(xml, status);
                };                

                jQuery(io).unbind();
                setTimeout( function(){
                try{
                              jQuery(io).remove();
                              jQuery(form).remove();
                } catch(e){
                        jQuery.handleError(s, xml, null, e);
                  }}, 100);
                xml = null;
            };
        }
        // Timeout checker
        if( s.timeout > 0 ){
            setTimeout( function(){ if(!requestDone ){uploadCallback( "timeout" );}}, s.timeout);
        }
        try{
                   var form = jQuery( '#' + formId);
                  jQuery(form).attr( 'action', s.url);
                  jQuery(form).attr( 'method', 'POST');
                  jQuery(form).attr( 'target', frameId);
            if(form.encoding){
                form.encoding = 'multipart/form-data';   
            } else{   
                form.enctype = 'multipart/form-data';
            }  
            jQuery(form).submit();

        } catch(e){  
            jQuery.handleError(s, xml, null, e);
        }
        /*if(window.attachEvent){
            document.getElementById(frameId).attachEvent(' onload', uploadCallback);
        }
        else{
            document.getElementById(frameId).addEventListener('load', uploadCallback, false);
        }   */
        jQuery( '#' + frameId).load(uploadCallback);
        return {abort: function () {}};

    },

    uploadHttpData: function( r, type ) {
        var data = !type;
        data = type == "xml" || data ? r.responseXML : r.responseText;
        // ifthe type is "script", eval it in global context
        if( type == "script" ){
         jQuery.globalEval( data );
        }
           
        // Get the JavaScript object, ifJSON is used.
        if( type == "json" ){
            data = r.responseText; 
            var start = data.indexOf( ">"); 
            if(start != -1) { 
              var end = data.indexOf( "<", start + 1); 
              if(end != -1) { 
                data = data.substring(start + 1, end); 
               } 
            } 
            eval( "data = " + data); 
        }
           
        // evaluate scripts within html
        if( type == "html" ){
         jQuery( "<div>").html(data).evalScripts();
        }
           
        return data;
    },
    /*handleError: function( s, xml, status, e ) {
            // If a local callback was specified, fire it
            if ( s.error )
                  s.error( xml, status, e );

            // Fire the global callback
            if ( s.global )
                  jQuery.event.trigger( "ajaxError", [ xml, s, e] );
      }*/
    handleError: function( s, xhr, status, e ) {
        // If a local callback was specified, fire it
        if ( s.error ) {
            s.error.call( s.context || s, xhr, status, e );
        }
        // Fire the global callback
        if ( s.global ) {
            (s.context ? jQuery(s.context) : jQuery.event).trigger("ajaxError" , [xhr, s, e] );
        }
    }
});
